Update UI through async calls MainFrameRepaint and AddressBookRepaint instead of a timer.

- Overall, this is better design
- This fixes problems with the address book UI not updating when the address book is changed through RPC
- Move Statusbar change detection responsibility to ClientModel

src/qt/addressbookpage.cpp

@@ -94,8 +94,6 @@ void AddressBookPage::setModel(AddressTableModel *model)
     this->model = model;
     if(!model)
         return;
-    // Refresh list from core
-    model->updateList();
 
     proxyModel = new QSortFilterProxyModel(this);
     proxyModel->setSourceModel(model);